The study of interfaces in quasicrystalline alloys is relatively new. Apart from the change in orientation, symmetry and chemistry which can occur across homophase and heterophase boundaries in crystalline materials, we have the additional, exciting possibility of an interface between quasicrystalline and its rational approximant. High resolution electron microscopy is a powerful technique to study the structural details of such interfaces. We report the results of a HREM study of the interface between the icosahedral phase and the related Al13Fe4 type monoclinic phase in melt spun and annealed Al65Cu20Fe15 alloy.

Pure and yttria, calcia doped zirconia powders were prepared in nanostructured form by the method of co-precipitation by hydrolysis. As prepared and heat treated powders were characterized by X-ray diffraction and transmission electron microscopy. Features and variations in crystallite/particle size measurements by both XRD and TEM are discussed.